Luke 17:21

Rogers and Rogers point out that ἐντὸς with the genitive can denote "within, in the midst of, among." A similar observation is made in BDAG Greek-English Lexicon; I looked at the entry for ἐντὸς in BDAG and it might pay to read the entire thing. This lexical source indicates that Luke's ἐντὸς ὑμῶν probably is patterned after Isaiah's ἐν σοὶ in 45:14 (LXX). BDAG also provides texts that correspond syntactically with Luke 17:21: the lexicon seems to argue that the verse in question should not be given a psychological interpretation. See pp. 340-341 and the relevant literature listed in BDAG.